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Prev Professional Automotive Repair Technical Discussions for April 5, 2012
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Open Help Requests for GM
Help Request Answers
2002 Cadillac Eldorado ETC 4.6L Lighting VIN: 1G6EC12972
The interior lights on this cadillac won't come on when either door is opened. I can watched the data stream and the BCM recognizes that the doors were opened, but the BCM is not commanding lights on. I can see the lighting command PID and it is not commanding...
1977 Chevrolet P30 Step-Van 4.8L Mechanical
starts easy, idles slightly rough, "pops" through carb as rpm is increased, vacuum drops just like a plugged exhaust (no CAT). Dropped the exhaust at the manifold and no change - still pops and vacuum drops (snaps back to 20) like a plugged exhaust. tried to...
1994 Chevrolet Camaro Z28 5.7L Excessive Emissions VIN: 2G1FP22P7R
While connecting my solus to the DLC, The Secoundary air system pump starts to run contenualy until key powers down or I disconnect the scanner? Also Cooling fans will not run but ECM show cammanding them on but no fans? will over heat on dyno (smog test) does...
2001 Chevrolet Silverado 3500 8.1L Unusual Downshifting VIN: 1GBJK34G51
There also is no gear indicator on the ipc,and no trans temp reading.there are currently no dtcs set.scan tool will not communicate with the trans but does communicate with the pcm.
2003 Chevrolet Impala 3.4L Charging Lite VIN: 2G1WF52E83
Customer complains about intermitten charging lite flashing on while driving, checked codes p0620,follow flow charts on mitchell no problem found.charging voltage 14.2v at present no lite on.???
2005 Chevrolet Silverado 2500 HD 6.6L Transmission VIN: 1GCHK23235
Hi guys, Truck came in with the bar under the "R" blinking and no reverse intermently. this is the (Allison Transmission) System has no codes, scanned data and found gear selection not correct when requested. I suspected the PNP/NSBU switch down on the side of...
2006 Chevrolet Cobalt SS 2.4L idle speed VIN: 1G1AM18B46
well this car came back to day for same code p0106 replaced map with gm part. did more testing check ref voltage at 5 volts had high resistance 10 ohms at (A) port on connector then would settle down to 5 ohms checked all three wires from map connector to ecm ...
2007 Chevrolet Silverado 3500 HD LT 6.0L No Start VIN: 1GBJK34K77
Customer drove to to U-Hall to get an electric trailer brake controller. They pulled down the 4 wires that were taped to the harness by the DLC connector, they now stripped the blunt ends and connected their trailer brake controller, No Crank, No high Beams,... Trouble codes: U0140 (Loss of Communication with BCM)
1993 GMC K1500 Suburban SLE 5.7L Cuts out, Stall, Poor Fuel Economy VIN: 1GKFK16K9P
Vehicle will not idle, must hold rpm over 1200, and in this scenario truck has all its power and fuel mileage. When setting base timing found that truck will idle on its own while spout connector or distributor lead is disconnected, but of course has no power ...
2005 Pontiac Vibe GT 1.8L MIL Lamp on VIN: 5Y2SN63L45
Here is the problem- Now Code P2441 comes up pending every time we start with engine cold, can't get it to run the monitor for OBDII. Looking at scanner data, the PCM never commands the AIR Solenoid ON to open the Shut-Off valve, although it does command the A... Trouble codes: P2441, P2445

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y83
Lots of good ideas and an a few that I wish people would read ALL the info I provided. We replace both crank sensors and test drove the car with a TechII while monitering the misfire graph. The problem seemed to always happen after car was driven over 10 miles... Trouble codes: P0300.
2007 Cadillac Escalade 6.2L CMP actuator VIN: 1GYFK63847
I would first like to say thank you to all of those who replied.. I did ohm out the Magnet as per a reply. From cold to hot. working to not working the Ohms remained around 7.5 average engine running. and 8 ohms with engine off.. again hot or cold. This ve...
1999 Chevrolet K3500 6.5L Excessive Emissions VIN: 1GBHK33F4X
The problem was in our Modis scanner. It for some reason did not support the pid for coolant temp. After this was discovered, we changed the fuel filter and we could not get vehicle to act up again. I don't believe it is fixed, but is not acting up any more...
2006 Chevrolet Equinox LT 3.4L Air bags VIN: 2CNDL73F06
I took it to the local Chevy dealer to have them program the SDM, and the code still came back, so they ran their dignostics on it and said it had the wrong part number EFS for the SDM. So, they replaced the EFS with the correct number EFS, programed the SDM,...
2006 Chevrolet Cobalt SS 2.4L MIL Lamp on VIN: 1G1AM15BX6
I have tryed a used TBI and ended up with the same problem. The fix was replacing the TBI new from GM and reprograming/updating the PCM. Trouble codes: P0833 (Clutch pedal switch 2 circuit), P0106 (MAP/BARO pressure circuit out of range).
2000 Pontiac Bonneville SSEi 3.8L Stall VIN: 1G2HZ5417Y
sorry for being late responding to all replies, customer just stopped by today and told me he sold the car. thanks to everyone who replied,i guesss we will never know what the fix was. Trouble codes: P0101, P0420.
2006 Pontiac G6 2.4L High idle speed VIN: 1G2ZF55B46
2005 Saturn Relay-3 3.5L steering gear VIN: 5GZDV23L95
The strut mounts we locking up and causing the jupy-ness in the steering wheel. Thank you for your help!
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